CODEWITHSUNDEEP
swiftuidatepicker
Prateek
Prateek

Reputation: 1754

Using 24 Hour DatePicker in Swift

I'm struggling to set the datepicker to only allow time and a 24 hour format in Swift, any ideas how to do this?

Thanks

Upvotes: 5

Views: 13388

Answers (4)

Jin
Jin

Reputation: 21

I was looking for this recently and almost gave up because most of the answers involved hardcoding a locale, which was not what I wanted to do. In iOS 16+ Locale.components alllow you to override some of the locale settings. You can probably do something like this:

var localeComponents = Locale.Components(locale: .current)
localeComponents.hourCycle = .zeroToTwentyThree
self.datePickerLocale = Locale(components: localeComponents)

DatePicker()
    .environment(\.locale, self.datePickerLocale)

Upvotes: 2

JPortillo
JPortillo

Reputation: 551

This is how you do the same in a View using the same hack described above.

import SwiftUI

struct ContentView: View {
    @State var time: Date = Date()
    var body: some View {
        VStack {
            DatePicker("Start Time", selection: $time, displayedComponents: .hourAndMinute)
                .labelsHidden()
                //Trick the Hour picker to show 24-hr format
                .environment(\.locale, Locale(identifier: "en_DK"))
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Upvotes: 1

Maulik Patel
Maulik Patel

Reputation: 2143

IOS Swift4

    let datePickerView: UIDatePicker = UIDatePicker()
    // For 12 hours Format
    datePickerView.locale = Locale(identifier: "en_US")
    // For 24 Hrs
    datePickerView.locale = Locale(identifier: "en_GB")

Upvotes: 6

Grimxn
Grimxn

Reputation: 22487

The OP says he is trying to recreate this answer in Swift. That answer is a kludge (it depends on Danish locale using 24-hour format, not on actually solving the problem), but here's how you would do that in Swift:

var datePicker = UIDatePicker() // Although you probably have an IBOutlet
datePicker.datePickerMode = UIDatePickerMode.Time
datePicker.locale = NSLocale(localeIdentifier: "da_DK")

but this is a kludge - roll your own UIPicker!

UPDATE The OP said that rolling your own is "hassle" - it's actually really easy - here's one simple way to do it (though a better way would be to subclass UIPickerView)...

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet weak var myDatePicker: UIPickerView!
    private var calendar = Calendar.autoupdatingCurrent

    override func viewDidLoad() {
        super.viewDidLoad()
        self.time = Date() // updates the picker to "now"
    }

    // MARK: UIPickerViewDataSource
    func numberOfComponents(in: UIPickerView) -> Int { return 2 }
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 { // Hours
            return 24
        }
        return 12 // five minute intervals
    }

    // MARK: UIPickerViewDelegate
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if component == 0 { // Hours
            return String(format: "%02d", row)
        }
        return String(format: "%02d", row * 5)
    }
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        print("picker changed, selected \(self.time)")
    }

    // MARK: Getting & setting the time
    var time: Date {
        get {
            let unitFlags: Calendar.Unit = [.year, .day, .hour, .minute, .second]
            var components = self.calendar.components(unitFlags, from: Date())
            components.hour = self.myDatePicker.selectedRow(inComponent: 0)
            components.minute = self.myDatePicker.selectedRow(inComponent: 1) * 5
            components.second = 0
            if let date = self.calendar.date(from: components) {
                return date
            }
            return Date() // shouldn't get here
        }
        set {
            var components = self.calendar.components([.hour, .minute], from: newValue)
            if let hour = components.hour, let minute = components.minute {
                self.myDatePicker.selectRow(hour, inComponent: 0, animated: true)
                self.myDatePicker.selectRow(minute / 5, inComponent: 1, animated: true)
            }
        }
    }
}

Upvotes: 7

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